package main
import "fmt"

type Books struct {
	title string
	author string
	subject string
	book_id int
}

func main() {
	var book1 Books
	var book2 Books

	book1.title = "《雾都孤儿》"
	book1.author = "狄更斯"
	book1.book_id = 1

	book2.title = "《人间四月天》"
	book2.book_id= 2

	
}